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ZiLOG System 8000 Hardware Reference Manual

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HRM
4.1.
General
Zilog
SECTION
4
THEORY
OF
OPERATION
HRM
This
section
discusses
the
theory
of
operation
of
the
System
8000
based
on
block
diagrams
of
various
levels
of
complex-
ity.
The
discussion
begins
with
the
basic
building
blocks
of
the
system,
system
bus,
the
board
modules
on
bus,
bus
conventions,
and,
:its
input/output.
The
text
goes
more
dee-
ply
into
the
operation
of
the
system:
interrupts,
address-
ing,
32
MB
Winchester
and
84
MB
SMD
disk
and
cartridge
tape
operations
and
interface,
and
peripheral
connection.
For
the
most
part,
this
discussion
does
not
cover
the
internal
operation
of
the
system
boards.
_.2.
System
Bus
The
block
diagram
in
Figure
4-1
shows
all
the
major
elements
of
the
System
8000
connected
to
the
32-bit
Z-Bus
Backplane
Interconnect
(ZBI).
The ZBI
is
the
system
bus
over
which
all
communication
between
the
elements
on
the
bus
take
.
place.
On
the
backplane
of
card
cage,
the
ZBI
is
connected
to
connectors
J11
through
J20.
On
the
logic
diagrams
and
assembly
drawings
for
the
printed
circuit
boards,
the
signal
lines
of
the
ZBI
are
connected
to
the
P1
connectors.
The
CPU
is
the
bus
controller,
and
any
other
element
on
the
bus
that
needs
to
gain
control
of
the
bus
must
request
con-
trol
from
the
CPU.
4.3.
Bus
Conventions
Signals
on
the
bus
may
be
active
in
either
a
high
or
a
low
state.
All
signals
that
use
the
bus
have
names
or
mnemonics
that
identify
them.
These
names
also
indicate
the
active
state
of
the
signal;
for
example,
the
signal
AS\
(address
strobe)
is
an
active
low
signal
because
it
has
a
back
slash
appended
to
it.
If
the
signal
appears
as
AS
with
no
back-
slash,
it
is
active
high.
The
back-slash
is
the
same
nota-
tion
as
the
over
bar
that
indicates
the
logical
complement
of
a
signal.
Sometimes,
active-low
signals
have
a
minus
sign
appended
to
them
as
in
AS-.
The
over-bar,
the
back-
slash,
and
the
minus
sign
all
mean
the
same
thing.
This
text
uses
the
back-slash;
some
of
the
drawings
use
either
the
over-bar
or
the
minus
sign
(-).
4-1
Zilog
4-1

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ZiLOG System 8000 Specifications

General IconGeneral
BrandZiLOG
ModelSystem 8000
CategoryDesktop
LanguageEnglish

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